A spectroscopic analysis of poly(lactic acid) structure

被引:197
作者
Kang, SH
Hsu, SL [1 ]
Stidham, HD
Smith, PB
Leugers, MA
Yang, XZ
机构
[1] Univ Massachusetts, Polymer Sci & Engn Dept, Amherst, MA 01003 USA
[2] Univ Massachusetts, Mat Res Sci & Engn Ctr, Amherst, MA 01003 USA
[3] Univ Massachusetts, Dept Chem, Amherst, MA 01003 USA
[4] Dow Chem Co USA, Analyt Sci, Midland, MI 48667 USA
关键词
D O I
10.1021/ma0016026
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A vibrational analysis has been carried out to analyze the chain conformation of poly(lactic acid) in the crystalline state. In conjunction with a normal-coordinate analysis, the Raman spectrum has yielded data regarding conformational distributions. Raman spectra of different helices were simulated using previously published structures, force constants, and intensity parameters. Some of the chain conformations predicted are inconsistent with the data. Only one of the four 3(1) helical structures predicted by conformational analysis agrees well with experiment. This analysis provides a new understanding regarding the relative probability of a 10(3) or 3(1) helix for poly(lactic acid).
引用
收藏
页码:4542 / 4548
页数:7
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